Endoscopic Frontal Sinus Surgery Research Articles

Causes and management of frontal sinusitis after transfrontal craniotomy

Objective:The aim of this study is to investigate the causes and the strategy of frontal sinusitis after transfrontal craniotomy by endoscopic frontal sinus surgery and traditional surgery with facial incision. Method:A total of thirty-four patients with frontal sinusitis after transfrontal craniotomy were admitted, with the symptom of purulence stuff, headache and upper eyelid discharging. The onset time was 2.6 years on average. The frontal sinus CT and MRI images showed frontal sinusitis. Twenty-seven patients were treated with endoscopic frontal sinus surgery, and seven patient was treated with combined endoscopic and traditional frontal sinus surgery. In the revision surgery, the bone wax and inflammatory granulation tissue were cleaned out in both operational methods. The cure standard was that the postoperative frontal sinus inflammation disappeared and the drainage of the volume recess was unobstructed. Result:Thirty-four patients had a history of transfrontal craniotomy, and there was a record of bone wax packing in every operation. Among twenty-seven patients with endoscopic frontal sinus surgery, Twenty-five cases cured and two cases were operated twice. Seven patients were cured with combined endoscopic and traditional frontal sinus surgery. Conclusion:The frontal sinusitis after transfrontal craniotomy may be related to the inadequate sinus management, especially bone wax to be addressed to the frontal sinus ramming leading to frontal sinus mucosa secretion obstruction and poor drainage. Endoscopic frontal sinus surgery is a way of minimally invasive surgery. The satisfying curative effect can be obtained by endoscopic removal of bone wax, inflammatory granulation tissue, and the enlargement of frontal sinus aperture after exposure to the frontal sinus, and some cases was treated with both operation method.

The application of 3D reconstruction in investigating the frontal sinus drainage pathway based on computer tomography data

Objective:The aim of this study is to explore the value of 3D reconstruction technology based on computer tomography data in understanding the frontal sinus drainage pathway. Method:Three-dimensional reconstruction of DICOM data from 100 cases of sinus CT was performed by using Mimics 19.0 software. The 3D models were used to study types, the relative locations of frontal sinus and recess cells as well as the influence of the frontal sinus drainage pathway. Result:The 3D model of frontal sinus, frontal recess cells and frontal sinus drainage pathway were reconstructed successfully. Among them, the incidence of nasal cavity was 95.5% (191/200), nasal cavity was 31.5% (63/200), nasal cavity on the frontal air room was 24.5% (49/200) supra bulla cells were 54% (108/200), supra bulla frontal cells were 14.5% (29/200), supraorbital ethmoid cells were 20.5% (41/200), and the rate of frontal septal cells were 4% (8/200). It visually demonstrated the relationship between the frontal recess and the frontal sinus drainage channel. Conclusion:The 3D reconstruction technology based on computer tomography data not only helps us to understand the anatomy of the frontal sinus, the relative position of the frontal crypt and the effect on the frontal sinus drainage channel, but also provides a new method for preoperative planning and intraoperative guidance to endoscopic frontal sinus surgery.

Endoscopic agger nasi type Draf IIb treatment for frontal sinus lesions.

Treatment of frontal sinus using surgery is complicated owing to the complex anatomical structure of the sinus region. The aim of the present study was to investigate the efficacy and safety of Draf IIb endoscopic frontal sinus surgery treatment for frontal sinus lesions using the agger nasi approach on 19 patients (28 left or and right nasal cavities). A 10–12 mm excision of the upper frontal maxilla was performed for endoscopic resection between the middle turbinate and lateral nasal wall. No serious complications in frontal sinus surgery treatment for the removal of the frontal sinus were observed. Patients were followed up after surgery for 6–36 months. Chronic sinusitis and nasal polyps were identified in 10 cases (19 left or and right nasal cavities; disease control, 15 left or and right nasal cavities; and disease partial control, 4 left or and right nasal cavities). Frontal sinus inverted papilloma was observed in 9 cases (9 left or and right nasal cavities). Frontal sinus inverted papilloma were successfully treated in 8 cases, and 1 case of recurrence was observed. In conclusion, the nasal endoscopic Draf IIb agger nasi approach is a minimally invasive treatment for frontal sinus lesions. This surgical procedure is safe and less complicated and may be applied in the clinic.

Evaluation of the frontal recess cells with image-guided system

Objective:To investigate the value of image-guided system in identifying the frontal recess cells.Method:We collected 30 cases that underwent image-guided frontal sinus surgery from November 2014 to December 2015. These frontal recess cells were devided into 2 groups based upon their locations in the frontal sinus ostium. Group A consists of the agger nasi cells, type Ⅰfrontal cells, type Ⅱ frontal cells and suprabullar cells; group B consist of type Ⅲ frontal cells, type Ⅳ frontal cells, frontal bullar cells, interfrontal sinus septal cells and supraorbital ethmoid cells. Visual analogue scale (VAS) was used to evaluate the degree of demand of image guide system on the location of frontal recess cells, and then analyzed the value of image guided system on the frontal recess cells.Result:In all 30 patients the imageguided frontal sinus surgery was successfully completed.The demand degree of image-guided system on frontal recess cells by VAS was slight for the agger nasi cells, type Ⅰfrontal cells, type Ⅱ frontal cells and suprabullar cells; the demand degree was general for the frontal bullar cells and interfrontal sinus septal cells; the demand degree was obvious for type Ⅲ frontal cells, type Ⅳ frontal cells and supraorbital ethmoid cells. Frontal recess cells of group B were more depended on image guided system than those of group A, and the difference was signicant(P <0.01).Conclusion:Imageguided system is valuable in distinguishing for type Ⅲ frontal cells,type Ⅳ frontal cells supraorbital ethmoid cells and interfrontal sinus septal cells.Furthermore,it is significantly helpful for accurate removal of these frontal recess cells in endoscopic frontal sinus surgery.

Endoscopic endonasal orbital transposition to expand the frontal sinus approaches.

The management of frontal sinus disease still remains a challenging issue for rhinologists. Although endoscopic frontal sinus surgery has significantly advanced over the past years, there are some conditions in which the external approaches are still necessary. Recently, the increasing experience in endoscopic sinus surgery together with important technologic advancements have allowed expansion of the indications for selected lesions localized more and more lateral into the frontal sinus. The aim of this study was to describe the endoscopic endonasal approach to the far lateral portion of the frontal sinus and to evaluate the outcomes of this technique. A retrospective evaluation was carried out with patients at a single institution, who, from 2004 to 2012, underwent an exclusive endoscopic transnasal approach to the far lateral portion of the frontal sinus at a single institution. The surgical technique included the Draf IIb procedure, a modified Lothrop procedure (Draf III), and endoscopic lateralization of the orbit, differently associated according to the needs of each case. Twenty-four patients were eligible for the present study. The lesions included were mucoceles in 9 cases, fibro-osseous lesions in 10 cases, and inverted papillomas in 5 cases. The overall follow-up ranged from 12 to 120 months (mean, 40.6 months). At the time of the last follow-up, no recurrence of disease was observed in the patients treated; in one case of osteoma, a small and stable in size (1 mm) persistent lesion was observed in an asymptomatic patient. One scheduled and one accidental cerebrospinal fluid leak with immediate skull base reconstruction occurred. No intraoperative or postoperative early or late orbital complication was observed in any case. The endoscopic endonasal orbital transposition seems to facilitate the endoscopic management of selected far-lateral frontal sinus lesions. However, it is a demanding procedure that requires experience and skill to avoid intraoperative skull base and orbital complications.

Endoscopic Management of Chronic Frontal Sinusitis: Prospective Quality of Life Analysis.

Previous studies of endoscopic frontal sinus surgery have been primarily retrospective and focused on symptom relief only. To prospectively assess the impact of endoscopic frontal sinus surgery on frontal sinus ostium patency and disease-specific quality of life as measured by the Rhinosinusitis Disability Index (RSDI). A 60-patient cohort with chronic frontal sinusitis (100 diseased frontal sinuses) was prospectively evaluated using the RSDI, computed tomography (CT) imaging, and endoscopic examination. Image-guided endoscopic frontal sinusotomy (Draf 2a) was performed in each case. Patients were assessed with RSDI and endoscopic assessment at least 6 months postoperatively. At a mean follow-up of 10 months, endoscopic assessment revealed patent frontal recesses in 90 of 100 frontal sinuses (90%), with significant improvement in the total RSDI score (41.98 ± 26.48 preoperatively to 17.15 ± 15.66 postoperatively) as well as each of its physical, emotional, and functional subscales from 16.3 ± 9.03, 12.23 ± 10.55, 13.45 ± 9.59 preoperatively to 5.95 ± 5.71, 5.55 ± 5.66, 5.65 ± 5.72 postoperatively, respectively. Similar improvement was seen in patients with asthma, polyps, and those undergoing revision sinus surgeries. With frontal recess mucosal preservation and meticulous postoperative endoscopic surveillance, endoscopic frontal sinusotomy results in high rates of frontal sinus ostium patency with significant improvement in quality of life.

Anatomical Variants in Frontal Recess Region and their Impact on Frontal Sinus Surgery in Chronic Sinusitis

Objective: To study the prevalence of anatomical variants in frontal recess region and their impact on frontal sinus surgery. Setting: University referral center. Patients and Methods: This was a clinical trial prospective study approved by Menoufia University research ethics board (REB) and included 50 Egyptian patients selected from the ENT department of Menoufia University between June 2011 to November 2014, who were suffering from chronic frontal sinusitis. Preoperative CT with coronal, axial and sagittal cuts were examined to show anatomical variants. Frontalsinusotomy was doneendoscopically and surgicall easiness was evaluated. Results: Increased aggernasi cell size was associated with increased operative easiness. Increase danteroposteri or diameter of frontal sinus ostium was associated with increased operative easiness.Type3frontoethmoidal air cell and interfrontal sinusseptal cells were more difficult in surgery than other frontoethmoidal air cells. Operativeeasiness correlated with different types of uncinate process superior attachment. Conclusions: Preoperative meticulous study of CT is very important for decision making in endoscopic frontal sinus surgery. Each anatomical variant in frontal recess area can be a predictor for operative easiness.

Use of a Foley catheter balloon as a tool during endoscopic frontal sinus surgery in a resource-poor environment.

This study aimed to evaluate the non-Food and Drug Administration-approved off-label use of a 10F Foley catheter as a tool during endoscopic frontal sinus surgery. A cohort of 40 patients with chronic frontal rhinosinusitis was prospectively evaluated using the Sino-Nasal Outcome Test (SNOT-22), computed tomography (CT) imaging, and endoscopic examination. Endoscopic sinus surgery (ESS) was performed in the usual fashion, however, when approaching the frontal sinus, a 10F Foley catheter was inserted and the balloon inflated in the frontal outflow. Patients were assessed postoperatively with SNOT-22, CT imaging, and endoscopic assessment at 6 months. Successful intraoperative dilation of the frontal recess was achieved in 62 of 69 frontal sinuses (90%). No cerebrospinal fluid leak or orbital entry occurred. Six months postoperative, SNOT-22 scores showed significant improvement, whereas endoscopic assessment revealed patent frontal recess in 55 of 62 (89%) frontal sinuses. Computed tomography imaging was completed in 25 patients comprising 41 operated frontal sinuses with no mucosal thickening seen in 37 of 41 (90%). The 10F Foley catheter is an effective tool to dilate the frontal recess by compression of edema during ESS. It may be a safe and cost-effective alternative to high-cost commercially available sinus balloons, especially in resource-poor environments.

A novel multipurpose mini-endoscope for frontal sinus endoscopy "sinus view".

Endoscopic frontal sinus surgery has been proven to enable the treatment of most frontal sinus pathologies but may be challenging for the surgeon in regard to the variable frontal sinus anatomy. Frontal sinus drainage identification and frontal sinus visualization are an essential part of successful frontal sinus surgery. We demonstrate a novel modular mini-endoscopic system for frontal sinus surgery. Fifty-two patients (37 male, 15 female) with a chronic rhino-sinusitis were enrolled. In this study, all patients were subjected to standard endonasal endoscopic sinus surgery with use of the fibre optic endoscope "Sinus View" (1.1 mm diameter, 10,000 pixels, irrigation channel and additional working channel) accessing the frontal sinus. A frontal sinus drainage type I in 38 cases, a frontal sinus drainage type IIa in 9 cases and a frontal sinus drainage type IIb in 5 cases according to Draf were performed. The modular mini-endoscopic system "Sinus view" was used to identify frontal sinus drainage in ten patients before ethmoidectomy and in the remaining patients (N = 42) after ethmoidectomy. Visualization of the frontal sinus drainage or the frontal sinus itself was easily carried out after irrigation. A clear identification of the frontal sinus by illumination was achieved in all cases. In addition the working channel of the endoscope was successfully used to perform visualized balloon dilatation at the frontal sinus drainage or for biopsy. The endonasal visualization of the frontal sinus drainage and frontal sinus itself is facilitated by also using a modular mini-endoscope with the option to use the working channel of the endoscope for biopsy or balloon dilatation.

Quality of life benefit after endoscopic frontal sinus surgery.

There is a lack of reports on the quality of life (QOL) assessment after frontal sinus surgery. This study aimed to assess the QOL of patients after one of three frontal sinus procedures, using the Glasgow Benefit Inventory (GBI) and the 22-item Sino-Nasal Outcome Test (SNOT-22). We designed an observational study with two arms. The first arm was a cross-sectional retrospective study recruiting all patients (with rhinosinusitis or mucocele) who had balloon sinuplasty, frontal recess clearance, or endoscopic modified Lothrop procedure in our tertiary referral unit at Newcastle upon Tyne Hospitals, between April 2010 and April 2012. The second arm was a prospective cohort study recruiting all patients having frontal sinus procedures between April 2012 and September 2012. The QOL was measured primarily by the GBI and SNOT-22 questionnaires. A total of 45 patients were recruited. Retrospectively, we identified 27 patients, of whom 19 (70%) returned the questionnaires. Eighteen patients were recruited in the prospective cohort and 14 (77.7%) of them completed the questionnaires 3 months postoperatively. The total benefit of frontal sinus surgery was found to be +31 for the retrospective group and +25.59 for the prospective arm. The three domains of GBI showed a positive impact after surgery. The general domain scored +37.5 in the retrospective study and +29.76 for the prospective one. The social domain scored +18.81 retrospectively and +21.42 prospectively. The physical domain scores were +17.71 retrospectively and +13 prospectively. The SNOT-22 preoperative score was +59.8 and this significantly improved to +35.2 (p = 0.017). Our study is the first report of QOL benefit after all three frontal sinus procedures using the validated GBI, showing benefit in all aspects of health domains. The physical symptoms and QOL assessed by SNOT-22 significantly improved after all three procedures.

Can sinus anatomy predict quality of life outcomes and operative times of endoscopic frontal sinus surgery?

PurposeEndoscopic sinus surgery (ESS) can manipulate sinus anatomy, but with limitations due to skull base and orbit anatomy. These anatomical structures dictate the maximal extent of ESS in the frontal recess and may limit surgical extent or operative duration. This study investigates the impact of these anatomical constraints on operative time and quality-of-life (QOL) outcomes. Materials and methodsPatients with medically refractory chronic rhinosinusitis undergoing Draf IIa frontal sinus surgery were prospectively enrolled. Anatomic measurements of the frontal sinus anatomy were collected during computed tomography review and included: widest distance between the frontal beak and posterior table, narrowest point in the ethmoid bed, Keros height, presence of an anterior ethmoid artery on a mesentery, and presence of inter-sinus septal cells. Primary outcomes included mean operative time and improvement in SinoNasal Outcome Test (SNOT-22) survey scores. Results63 adult participants were enrolled and followed 13.8 (5.2) months on average. The ethmoid bed mean width was 7.2 (1.4) mm, the mean distance from frontal beak to the posterior table at widest was 9.0 (2.7) mm, and mean Keros height was 5.1 (1.8) mm. 49/63 (83.1%) of participants had inter-sinus septal cells and 30/63(50.8%) had anterior ethmoid arteries on a mesentery. Mean operative time was 121.5 (44.0) min while SNOT-22 scores significantly (p<0.001) improved 26.1 (21.6) on average. Anatomic measurements were not predictive of operative time or mean QOL change (p>0.050). ConclusionsFrontal sinus surgery is an effective treatment for a range of frontal and ethmoid sinus anatomy. Further study with larger sample size and measures of more restricted anatomy might elucidate treatment limitations of ESS.

Causes of failure in endoscopic frontal sinus surgery in chronic rhinosinusitis patients

The frontal sinus is the most challenging area to address in endoscopic sinus surgery (ESS). Incomplete surgery or iatrogenic injury in the narrow space of the frontal recess with synechia formation can lead to recurrence or persistence of disease. The goal of this study was to identify causes of failure of endoscopic frontal sinus surgery and to determine complication rates. A cross-sectional retrospective study was conducted. Charts and preoperative sinus computed tomography (CT) scans of patients who underwent revision frontal ESS for chronic frontal rhinosinusitis, between 2006 and 2012 were reviewed. Of 829 patients who underwent ESS during the study period, 740 had the frontal recess dissected and frontal sinus opened. Of these, 66 patients had revision surgery of the frontal sinus, with a total of 109 frontal sinuses. The mean ± standard deviation (SD) age was 52 ± 12.9 years. Forty patients were male (59.1%). The most common findings were the following: edematous or hypertrophic mucosa (92.7%); retained agger nasi cell (73.4%); neo-osteogenesis within the frontal recess (45.9%); lateral scarring of the middle turbinate (47.7%); residual anterior ethmoid air cell (32.1.%); and residual frontal cells (24.8%). With the exception of mucosal disease and neo-osteogenesis, all identified causes of failure of frontal sinus surgery are a result of surgical technique. Careful preoperative planning and meticulous and complete surgical execution are therefore critical for a successful surgical outcome in primary frontal sinus surgery.

Advances in endoscopic Frontal Sinus Surgery

The challenging nature of endoscopic frontal sinus surgery, owing to the tendency for recurrent disease as well as the close proximity of critical structures, mandates a comprehensive understanding of operative strategies. The development of newer technologies such as surgical navigation and balloon instruments may instill a false confidence in the surgeon. The objectives of this update are to describe anatomical principles and surgical techniques involved with the various Draf procedures and to review the indications for frontal sinus surgery. The Draf approaches and associated variations have revolutionized the management of chronic frontal rhinosinusitis, as purely endoscopic approaches may minimize the morbidities classically accompanying open procedures.

Endoscopic Frontal Sinus Surgery

Surgery on the frontal sinus or frontal recess remains a challenge for rhinologist because of its variability and complex anatomy. Its location, relatively complex and narrow frontal recess also make visualization difficult and predispose it to stenosis. Significantly, serious complications are possible due to the anterior ethmoidal artery, orbit and anterior cranial fossa. An understanding of frontal sinus and frontal recess anatomy is essential to perform endoscopic frontal sinus surgery. This paper examines frontal sinus anatomy and then variable procedures of endoscopic frontal sinus surgery. The selection of less invasive procedure as possible after assessment of the patient’s history, diagnostic endoscopy, and the CT scan makes successful endoscopic treatment of frontal sinus diseases. Korean J Otorhinolaryngol-Head Neck Surg 2014;57(10):657-63 Key WordsZZEndoscopic sinus surgery ㆍFrontal recess ㆍFrontal sinus.

Guide Wire Augmented Nasofrontal Sinusotomy (GWANS)

Endoscopic frontal sinus surgery remains as a very challenging technique with potential for serious morbidity and even mortality. The close proximity of orbital contents, the cribriform plate and the anterior skull base pose serious challenges in performing this operation safely. The frontal recess anatomy is even more treacherous in recurrent cases and in diseased processes such as polyps and other tumors blocking the nasofrontal recess. Guide Wire Augmented Nasofrontal Sinusotomy (GWANS) allows for real time surgical guidance allowing the surgeon to confidently dissect through diseased tissue knowing all along where the boundaries of the nasofrontal recess lies and thus avoid injuring vital structures. This is a new and adjunctive tool for augmenting the standard endoscopic nasofrontal sinusotomy technique.

Efficacy of the modified endoscopic frontal sinus surgery for recurrent chronic frontal sinusitis.

To modify the endoscopic frontal sinus surgery and improve the therapeutic effect of recurrent chronic frontal sinusitis (RCFS). Eighty-five patients with RCFS were divided into two groups. Endoscopic frontal sinus surgery through an approach of Frontomaxillary Process-Agger Nasi, a modified Draf IIb procedure, was carried out in 51 patients (Group A), and conservative medication was applied in 34 patients as control (Group B). The therapeutic effect was prospectively evaluated with statistically validated measures of sinusitis-specific quality of life, sino-nasal outcome test-20 questionnaire (SNOT-20). Compared with pre-treatment, the average total score of SNOT-20 in RCFS patients was significantly decreased at the time of 6, 12months after modified endoscopic frontal sinus surgery and medical treatments (p<0.05). However, the total score of SNOT20 was significantly lower in group A than group B at the same period of the follow-up after treatments (p<0.05). The overall efficacy evaluated by patients' self showed that the rate of "much improved" and "improved" was respectively 68.6 and 17.6% in group A, and significantly better than group B (p<0.001). Furthermore, the frontal sinus patency rate in group A was 85%, and significantly higher than group B (p<0.001). Endoscopic frontal sinus surgery through an approach of Frontomaxillary Process-Agger Nasi, a modified Draf IIb procedure, is an effective procedure to treat the RCFS.

Frontal Sinus Surgery Anterior to the Ethmoid Bulla

The frontal sinus surgery is difficult to perform but the ethmoid bulla is a relative, constant landmark in the middle turbinate that can improve the surgery. The purpose of this study was to evaluate the validity, security, and predominance of approaches to the frontal sinus via the route anterior to the ethmoid bulla. The data from 370 endoscopic frontal sinus surgery cases from our center were integrated and retrospectively analyzed. Three hundred twenty-nine patients underwent frontal sinus surgery via the route anterior to the ethmoid bulla. An additional 27 patients underwent frontal sinus surgery with mini-trephination, 13 patients with the Draf II procedure, and 1 patient had applied MELP (modified endoscopic Lothrop procedure). No serious complications occurred; however, there were 3 cases of eyelid ecchymosis and 1 case of anterior ethmoid artery bleeding. In all, 319 patients (86.2%) were cured, an improvement was noted in 36 of the patients (9.7%), and there was no improvement in 15 patients (4.1%). Frontal sinus surgery via the route anterior to the ethmoid bulla is valid, relatively safe, and can be applied in most cases involving frontal disease.

Mini-endoscopy of the frontal sinus to guide endonasal frontal sinus surgery

Endoscopic frontal sinus surgery requires special attention to the numerous anatomical variations. Additionally, in situations of revision surgery, endonasal frontal sinus identification may be challenging. Numerous strategies have been described to access the frontal sinus in endonasal endoscopic frontal sinus surgery including an additional external approach. A pilot study is presented using a newly designed modular mini-endoscope (1.1 mm, 10.000 pixel, 2 working channels and 120° lens) to assist the frontal sinus surgery through a transcutaneous puncture of the frontal sinus. We used this mini-endoscope for primary frontal sinus surgery on 3 patients and for revision frontal sinus surgery on 4 patients. In all patients, the mini-endoscope could be placed in the frontal sinus without side effects. The visible illumination at the frontal sinus floor, caused by the mini-endoscope being in the frontal sinus, guided the surgeon endonasally directly to the frontal sinus floor. Frontal sinus drainage was achieved by the described guidance on all patients. In conclusion, mini-endoscopy of the frontal sinus might be an interesting option in endoscopic frontal sinus surgery to guide the surgeon by illumination in complex anatomical situations to the frontal sinus. This technique will contribute to further improvement in endonasal endoscopic frontal sinus surgery.

A Study of Anatomy of Frontal Recess in Patients Suffering from ‘Chronic Frontal Sinus Disease’

A study designed to describe the anatomical features of the frontal recess area in patients suffering from chronic frontal sinusitis. A prospective study done in adult patients admitted in our hospital between July 2009 to June 2011. Tertiary level, private ENT care centre. 50 adult patients of chronic frontal sinusitis who did not have history of previous sinus surgery. The frontal recess anatomy was studied by 2mm slice CT scans pre-operatively. CT findings were confirmed intra operatively by meticulous dissection in frontal recess area endoscopically with aid of image guided system. A chart prepared for each patient of different anatomical variations present in frontal recess on each nasal side and analyzed. Agger nasi cell was found in 94% of cases. The superior attachment of the uncinate was to the lamina papyraceae in 82% of cases. Type 1 frontal recess cells were found in 44%, type 2 in 8%, type 3 in 48% and type 4 in 2% of the cases. Over all 74% of cases had frontal recess cells. The management of frontal sinusitis is a challenge to endoscopic surgeon and as more and more rhinologists got expertise in endoscopic sinus surgery skills; the next challenge is management of frontal sinus. Hence, the need arises for more precise study of frontal recess anatomy. Detailed studies of anatomic features of the frontal recess by coronal and sagittal CT scans are very important and helpful for endoscopic frontal sinus surgery. Our study suggests that there is high prevalence of frontal recess cells in Indian population suffering from frontal sinusitis.

Unilateral Transnasal Endoscopic approach to Frontal Sinuses: Draf IIc

For chronic sinusitis surgery, the Draf III approach provides a common median drainage pathway for bilateral frontal sinuses from orbit to orbit. The Draf IIb provides unilateral drainage from orbit to septum. In several cases, inclusion of the nasal and frontal sinus septum in a Draf IIb was advantageous without extension to the opposite frontal recess. The proposed nomenclature is Draf IIc. This study was designed to (1) develop a surgical option for chronic frontal sinusitis where access to one frontal recess is limited or unnecessary and (2) minimize unnecessary surgical manipulation of uninvolved areas. Revision endoscopic frontal sinus surgery was performed on two patients with persistent frontal sinus opacification. Surgery crossed midline including one frontal recess with resection of the superior nasal septum. The surgical result was assessed on endoscopy and computed tomography (CT). The postoperative course was unremarkable with relief of frontal pressure. Postoperative CT scan showed well-aerated frontal sinuses with a widely patent common drainage pathway. Postoperative nasal endoscopy revealed normal mucosa with no exposed bone or edema. The Draf IIc extends the Draf IIb across the midline, without including the opposite frontal recess. This can be accomplished most easily using an interfrontal sinus septal cell or an eccentric interfrontal sinus septum. The Draf IIc is a surgical option in cases of chronic or recalcitrant frontal sinus diseases, including unilateral or bilateral obstruction, where access to the ipsilateral frontal recess is limited or favorable anatomy allows drainage with reduced manipulation of an uninvolved side.